Planet Technology MGSW-004 - Manual (Page 22)

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You can add, edit and remove port members of each trunk and then press "Apply" button after
you have finished configuring the trunks you need.
( Note : Make sure trunking ports are in the same VLAN group. )
4.8 STP
Spanning tree is a link management protocol that provides path redundancy while preventing
undesirable loops in the network. For Layer 2 Ethernet network to function properly, only one
active path must exist between two stations.
The spanning-tree algorithm calculates the best loop-free path throughout a switched network.
STP forces redundant data paths into a standby (blocked) state. If a network segment in the
spanning tree fails and a redundant path exists, the spanning-tree algorithm recalculates the
spanning tree topology and activates the standby path.